JWH-051 is an analgesic drug which is a cannabinoidagonist. Its chemical structure is closely related to that of the potent cannabinoid agonist HU-210, with the only difference being the removal of the hydroxyl group at position 1 of the aromatic ring. It was discovered and named after Dr. John W. Huffman.

JWH-051 retains high affinity for the CB1receptor, but is a much stronger agonist for CB2, with a Ki value of 14nM at CB2 vs 19nM at CB1.[1] It was one of the first CB2-selective ligands developed, although its selectivity for CB2 is modest compared to newer compounds such as HU-308.